Bluetooth signal receiving method and device using improved packet detection and symbol timing acquisition

Abstract

Disclosed herein are a Bluetooth signal receiving device and method for receiving a Bluetooth signal. The Bluetooth signal receiving device includes a discriminator circuit and a correlator circuit. The discriminator circuit generates a baseband signal by performing frequency shift demodulation on a received signal, and generates a frequency proportion signal having a value proportional to the frequency of the baseband signal. The correlator circuit detects a packet assigned to the Bluetooth signal receiving device by comparing the frequency proportion signal with an access address received from a link layer. The Bluetooth signal receiving device may detect a packet, assigned to the Bluetooth signal receiving device itself, by using access address information of a link layer.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims under 35 U.S.C. § 119(a) the benefit of Korean Patent Application No. 10-2015-0189879 filed on Dec. 30, 2015, which is incorporated herein by reference.TECHNICAL FIELD[0002]The present invention relates to technology for packet detection and symbol timing acquisition for a Bluetooth Smart receiving device, and more particularly to a device and method for constructing a high-sensitivity receiver that smoothly operates in a low signal-to-noise power ratio region through cooperation between a physical layer and a link layer in a Bluetooth Smart device.[0003]The present invention was derived from the research conducted as a part of the Industrial Core Technology Development Project sponsored by the Korean Ministry of Trade, Industry and Energy and the Korea Institute of Industrial Technology Evaluation and Planning [Project Management Number: 10052626; Project Name: Development of BLE (Bluetooth Low-Energy) v4.2 Support...

AI Technical Summary

Benefits of technology

[0018]The receiving sensitivity defined in the Bluetooth Smart standard is −70 dBm. In a −70 dBm received signal region compliant with the standard, received signal-to-noise power ratio corresponds to 30 dB or more, and thus the sensitivity of a received signal is considerably superior to that of a noise component. Accordingly, automatic gain control (AGC) and the estimation of various types of offset can be performed within a short period of time in the initial period of a preamble interval, and a packet can be detected within the remaining interval of the preamble interval. Furthermore, in the −70 dBm received signal region, a received signal-to-noise power ratio is high, and thus high-performance bit demodulation and decision calculation are not required, so that signal processing, such as a hard limiter, can be used. In this case, elaborate automatic gain control is not required, and thus the time assigned to packet detection can be relatively increased, so that it seems that there is no problem.

[0020]Accordingly, to meet a demand for a high-sensitivity receiver for a Bluetooth signal, a method capable of increasing the accuracy of packet detection and symbol timing acquisition even in a low signal-to-noise power ratio environment is required.

[0021]The average value of white noise has the characteristic of converging to zero as the number of available samples increases. That is, according to the averaging characteristic of noise, as the number of samples used in calculation increases, noise is proportionally removed, so that a desirable correlation characteristic is obtained and packet detection performance is improved. An object of the present invention is to provide technology for increasing the accuracy of packet detection and symbol timing acquisition by significantly increasing sample time used to obtain a correlation characteristic.

Problems solved by technology

It is difficult to accurately perform all offset compensation calculation, such as automatic gain control, frequency offset estimation and symbol timing estimation, and packet detection calculation adapted to determine whether a packet is present merely in a short 8-μs preamble interval.

When accuracy is decreased in a preprocessing process, such as offset compensation and packet detection, gain attributable to post-processing calculation cannot be expected.

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